| 摘要 |
A flute has a tubular body having a plurality of openings therein, a plurality of flaps, a secondary flap, and mechanisms for moving each of the plurality of flaps and the secondary flap. The plurality of flaps can be moved into and out of engagement with a respective one of the tubular body openings, and at least one of the plurality of flaps is an annular flap which has an opening therein. The annular flap can be moved independent from the secondary flap and the rest of the plurality of flaps into and out of engagement with a respective one of the tubular body openings such that the respective one of the tubular body openings is partially closed and opened, respectively. Moreover, the secondary flap can be independently moved from the plurality of flaps into and out of engagement with the annular flap opening such that the annular flap opening is closed and opened, respectively.
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